The First Space Elevator: Where Would We Build It?
★
★
★
★
★
5/5
Tuit catalog
Synthesis notes of video analyses, assessed and condensed, in French and English.
57,037 tuit
·
983 channels
·
42 domains
·
Last update: Nov 15, 2026
Agriculture & Food
185
AI — Models & Research
4758
AI — News & Applications
2324
AI & Society
1344
Archaeology
144
Arts & Architecture
1523
Astronomy & Cosmology
3753
Biology
2249
Chemistry
353
Climate & Ecology
1126
Computing & Cybersecurity
4631
Control & Robotics
400
Earth Sciences & Geography
311
Economics & Finance
4193
Education
814
Energy
1597
Engineering & Technology
3487
Foresight & Science Fiction
345
Geopolitics & Defence
606
History
801
Hobbies & Practical
474
Language & Linguistics
330
Law & Justice
604
Literature & Writing
991
Mathematics
2408
Media & Information
311
Medicine & Health
3303
Neuroscience
453
Paleontology
104
Personal Development
1293
Philosophy & Ethics
904
Physics
3660
Politics & Institutions
781
Psychology
685
Religion & Beliefs
261
Science — General & History
1912
Society & Culture
1235
Space Exploration
979
Sports
98
Transport & Mobility
234
Urban Planning & Mobility
104
Video Games
969
JMP
Abnormal psychology
24
VSC
Advice on careers and achieving success
150
TRP
Aerospace and aviation technology
957
PBF
Algebra
267
PBMW
Algebraic geometry
165
PBPD
Algebraic topology
84
UMB
Algorithms and data structures
84
KNBT
Alternative and renewable energy industries
140
THV
Alternative and renewable energy sources and technology
182
MKJD
Alzheimer’s, dementia, Parkinson’s disease and other neurodegenerative diseases
68
QDHA
Ancient Greek and Roman philosophy
53
NHC
Ancient history
37
JBFU
Animals and society
24
PBW
Applied mathematics
20
TTB
Applied optics
47
NKDS
Archaeological sites
36
NK
Archaeology
44
NKD
Archaeology by period
31
AM
Architecture
36
UYQD
Artificial general intelligence (AGI)
54
UYQ
Artificial intelligence (AI)
2323
LNQH
Artificial intelligence law and regulations
24
NHF
Asian history
20
VSPM
Assertiveness, motivation, self-esteem and positive mental attitude
509
TTDS
Astronautics
1001
PGG
Astronomical observation: observatories, equipment and methods
116
PG
Astronomy, space and time
923
PHVB
Astrophysics
122
PHM
Atomic and molecular physics
75
MKJA
Autism Spectrum Disorder
20
TJFM
Automatic control engineering
71
TRC
Automotive technology and trades
35
TRPS
Aviation skills and piloting
22
KFFK
Banking
23
THYB
Battery technology
207
PBTB
Bayesian inference
33
PSB
Biochemistry
314
RNCB
Biodiversity
37
PSAD
Bioethics
41
DNBH
Biography: historical, political and military
85
DNBM
Biography: philosophy and social sciences
20
DNBR
Biography: royalty
26
DNBT
Biography: science, technology and medicine
84
DNBL
Biography: writers
40
PS
Biology, life sciences
30
MQW
Biomedical engineering
24
PHVN
Biophysics
30
TCB
Biotechnology
63
TNK
Building construction and materials
35
TNKE
Building physics and energy-efficient construction
21
KJ
Business and Management
60
KJJ
Business and the environment; sustainable approaches to business
43
KJG
Business ethics and social responsibility
21
KJD
Business innovation
52
KJC
Business strategy
60
PBKA
Calculus
45
PBK
Calculus and mathematical analysis
66
MJD
Cardiovascular medicine
39
JNR
Careers guidance
40
PSAN1
Cellular and molecular neuroscience
23
PSF
Cellular biology (cytology)
135
JPQB
Central
70
PN
Chemistry
29
MJCL2
Chemotherapy
26
JMC
Child, developmental and lifespan psychology
33
AMVD
City and town planning: architectural aspects
34
NHWR3
Civil wars
23
PHD
Classical mechanics
197
RNPG
Climate change
239
RBPC
Climatology and climate modelling
40
MBGR1
Clinical trials
25
UTC
Cloud computing
35
GPJ
Coding theory and cryptology
42
JMR
Cognition and cognitive psychology
143
PSAN5
Cognitive and behavioural neuroscience
254
GTK
Cognitive studies
40
NHTW
Cold wars and proxy conflicts
20
PBV
Combinatorics and graph theory
55
GTC
Communication studies
36
TJK
Communications engineering
42
DSM
Comparative literature
23
LNCH
Competition law
29
PBKD
Complex analysis, complex variables
60
PSAX
Computational biology
114
KNTV
Computer and video game industry
243
UXT
Computer applications in industry and technology
20
UYF
Computer architecture and logic design
126
URH
Computer fraud and hacking
297
AKLF
Computer game art
21
UDX
Computer games
672
UGG
Computer games design
251
UK
Computer hardware
92
UYM
Computer modelling and simulation
24
UT
Computer networking and communications
27
UY
Computer science
73
UR
Computer security
774
URJ
Computer viruses, Trojans and worms
32
UYQV
Computer vision
122
PHFC
Condensed matter physics (liquid state and solid state physics)
144
RNKH
Conservation of wildlife and habitats
34
JBGX
Conspiracy theories
55
LNDX
Constitution
32
VFJB3
Coping with
21
KFFH
Corporate finance
32
JPZ
Corruption in politics, government and society
33
PGK
Cosmology and the universe
1063
CBV
Creative writing and creative writing guides
23
JKVF
Criminal investigation and detection
43
URY
Data encryption
20
GPH
Data science and analysis
41
UN
Databases
20
GTS
Decolonisation of knowledge
50
KCM
Development economics and emerging economies
67
GTP
Development studies
45
PSC
Developmental biology
41
MBNH3
Dietetics and nutrition
30
PBMP
Differential and Riemannian geometry
42
PBKJ
Differential calculus and equations
98
UBJ
Digital and information technologies: social and ethical aspects
1338
UB
Digital and Information technology: general topics
67
UXA
Digital Humanities
50
UD
Digital Lifestyle and online world: consumer and user guides
36
KCVM
Digital or internet economics
69
WNA
Dinosaurs and the prehistoric world: general interest
74
JPSD
Diplomacy
38
JBFM
Disability: social aspects
27
JBCT5
Disinformation and misinformation
78
KJDD
Disruptive innovation
31
KJMV22
Diversity, equality, equity and inclusion in the workplace
20
ATFR
Documentary films
24
RNFD
Drought and water supply
29
PHDT
Dynamics and statics
82
TNCE
Earthquake engineering
20
QDHC
East Asian and Indian philosophy
30
PSAF
Ecological science, the Biosphere
53
KCX
Economic and financial crises and disasters
44
KCA
Economic theory and philosophy
35
KC
Economics
22
JN
Education
29
JNDH
Education: examinations and assessment
31
JNK
Educational administration and organization
21
JNV
Educational equipment and technology, computer-aided learning (CAL)
78
JNC
Educational psychology
31
JNF
Educational strategies and policy
30
JPHF
Elections and referenda
50
TRV
Electric vehicles
102
THR
Electrical engineering
77
KNBL
Electrical power generation and distribution industries
282
PHK
Electricity, electromagnetism and magnetism
280
TJFD
Electronic devices and materials
262
TJFC
Electronics: circuits and components
190
PHDB
Elementary mechanics
38
VSPQ
Emotions and emotional intelligence
30
MJG
Endocrinology
24
PHDY
Energy
26
LNCR
Energy and natural resources law
39
THYC
Energy efficiency
70
KNB
Energy industries and utilities
227
RNFY
Energy resources
56
THY
Energy, power generation, distribution and storage
393
TGMB
Engineering thermodynamics
25
TBC
Engineering: general
23
TGMF
Engineering: Mechanics of fluids
23
TGMD
Engineering: Mechanics of solids
25
UFL
Enterprise software
61
KJH
Entrepreneurship
211
KCVG
Environmental economics
112
MBNH2
Environmental factors
52
RND
Environmental policy and protocols
211
RNA
Environmentalist thought and ideology
81
MBNS
Epidemiology and Medical statistics
127
SXE
eSports
25
QDTQ
Ethics and moral philosophy
55
PSVP
Ethology and animal behaviour
43
PBMH
Euclidean geometry
44
NHD
European history
27
PSAJ
Evolution
180
PSXE
Evolutionary anthropology
92
UYQE
Expert systems
27
JPFQ
Far-right political ideologies and movements
22
ATFG
Film guides and reviews
112
ATFA
Film history, theory or criticism
47
ATFN
Film: styles and genres
342
KFF
Finance and the finance industry
37
KFFF
Financial technology (fintech)
36
RNFF
Food security and supply
39
PBKF
Functional analysis and transforms
32
PGM
Galaxies and stars
352
UMK
Games development and programming
48
JBSF
Gender studies, gender groups
28
JBSF1
Gender studies: women and girls
105
MKZV
Gene therapy
41
GTZ
General studies and General knowledge
36
UYQF
Generative artificial intelligence
2702
TCBG
Genetic engineering
52
PSAK
Genetics (non-medical)
660
RBG
Geology, geomorphology and the lithosphere
28
PBM
Geometry
22
PHVG
Geophysics
41
JPSL
Geopolitics
333
THVG
Geothermal energy and power
37
PHDV
Gravity
35
KFFS
Green finance
60
PBG
Groups and group theory
105
MJF
Haematology
23
MBP
Health systems and services
39
JBFN
Health, illness or addiction: social aspects
25
VFMD
Health: Diets and nutrition
25
TNKH
Heating, lighting, ventilation
25
MJJ
Hepatology
40
JNM
Higher education, tertiary education
252
MFCH
Histology
20
RBGF
Historical geology and palaeogeology
51
NHAH
Historiography
36
NH
History
41
AGA
History of art
40
UBB
History of Computing, digital and information technologies
59
TBX
History of engineering and technology
33
JBCC9
History of ideas
20
PBX
History of mathematics
43
NHQ
History of other geographical groupings and regions or specific cultures
27
PDX
History of science
166
KJZ
History of specific companies
46
NHK
History of the Americas
56
NHT
History: specific events and topics
29
JBFD
Housing and homelessness
23
PSX
Human biology
27
JPVH
Human rights, civil rights
48
THD
Hydrogen technologies
63
THVH
Hydropower
25
TTBM
Imaging systems and technology
26
MJCM
Immunology
102
PDR
Impact of science and technology on society
129
AMB
Individual architects and architectural firms
33
AGB
Individual artists, art monographs
35
ATFB
Individual film directors, film-makers
31
PDG
Industrial applications of scientific research and technological innovation
55
MJCJ
Infectious and contagious diseases
56
KNTX
Information technology industries
441
JWD
Information warfare
33
PSVA2
Insects (entomology)
23
GTV
Institutions and learned societies: general
34
PBKL
Integral calculus and equations
29
GT
Interdisciplinary studies
23
KCL
International economics
21
JPSN
International institutions
28
JPS
International relations
27
KCLT
International trade and commerce
55
ATN
Internet and digital media: arts and performance
53
UDB
Internet guides and online services
39
UBW
Internet: general works
43
JMHC
Interpersonal communication and skills
33
DNPB
Interviews
48
TBY
Inventions and inventors
23
KFFM
Investment and securities
155
KJMV3
IT and information systems management
42
VSCB
Job hunting
29
KCF
Labour
102
PHJL
Laser physics
50
TTBL
Laser technology and holography
22
PSA
Life sciences: general issues
24
ULJL
Linux
23
DSRC
Literary companions, book reviews and guides
37
DSBB
Literary studies: ancient, classical and medieval
24
DSK
Literary studies: fiction, novelists and prose writers
77
DSB
Literary studies: general
27
DSC
Literary studies: poetry and poets
50
DSA
Literary theory
30
UYQM
Machine learning
1208
UKPM
Macintosh
23
KCB
Macroeconomics
23
KJMB
Management: leadership and motivation
74
PSPM
Marine biology
24
NHTM
Maritime history
34
TGM
Materials science
60
MKCM
Materno-foetal medicine
41
PHU
Mathematical
181
PBCD
Mathematical logic
114
PBWH
Mathematical modelling
54
UYA
Mathematical theory of computation
259
PB
Mathematics
173
MFKH3
Maturation and ageing
79
JBCT
Media studies
26
JBCT1
Media studies: internet, digital media and society
73
JBCT4
Media studies: journalism
90
MBPM
Medical administration and management
23
MBF
Medical and health informatics
67
MFN
Medical genetics
183
MKS
Medical imaging
21
MBGL
Medical laboratory testing and techniques
21
PHVD
Medical physics
20
MBGR
Medical research
61
MB
Medicine
26
RBPM
Meteorology
39
PSG
Microbiology (non-medical)
67
JBFH
Migration, immigration and emigration
34
JWK
Military and defence strategy
48
NHWR9
Military history: post-WW2 conflicts
20
VSPD
Mindfulness
22
TTU
Mining technology and engineering
22
UMS
Mobile and handheld device programming
24
TJKT1
Mobile phone technology
26
UDT
Mobile phones and smartphones: consumer
62
PSD
Molecular biology
189
KCBM
Monetary economics
83
JNAM
Moral and social purpose of education
27
WGCB
Motor cars: general interest
28
GLZ
Museology and heritage studies
56
TBN
Nanotechnology
34
UYX
Natural computing
911
RNR
Natural disasters
27
UYQL
Natural language and machine translation
161
WN
Nature and the natural world: general interest
47
UTN
Network security
64
UTP
Networking standards and protocols
27
UYQN
Neural networks and fuzzy systems
472
MKJ
Neurology and clinical neurophysiology
59
PSAN
Neurosciences
128
KNTP2
News media and journalism
25
PNRL
Nuclear chemistry, photochemistry and radiation
27
RNQ
Nuclear issues
31
MKR
Nuclear medicine
66
PHN
Nuclear physics
115
THK
Nuclear power and engineering
226
PBH
Number theory
192
PBKS
Numerical analysis
41
MQC
Nursing
24
MQCA
Nursing fundamentals and skills
39
RBKC
Oceanography (seas and oceans)
61
MJCL
Oncology
134
KJSG
Online marketing
39
MJQ
Ophthalmology
23
PHJ
Optical physics
181
PBU
Optimization
33
TTMW
Ordnance, weapons technology
22
PNN
Organic chemistry
67
RBX
Palaeontology
104
MKB
Palliative medicine
37
UYFP
Parallel processing
27
PHP
Particle and high-energy physics
148
GTU
Peace studies and conflict resolution
42
MBNH
Personal and public health
24
UKP
Personal computers
29
VSB
Personal finance
58
UDA
Personal organization software and apps
25
KJMV2
Personnel and human resources management
42
KNBP
Petroleum, oil and gas industries
96
MKG
Pharmacology
77
QD
Philosophy
48
JNA
Philosophy and theory of education
44
PBB
Philosophy of mathematics
33
QDTM
Philosophy of mind
90
PDA
Philosophy of science
155
QDTK
Philosophy: epistemology and theory of knowledge
129
QDTL
Philosophy: logic
47
QDTJ
Philosophy: metaphysics and ontology
42
PNR
Physical chemistry
72
PH
Physics
201
PHDF
Physics: Fluid mechanics
56
JMM
Physiological psychology, neuropsychology, biopsychology
26
MFG
Physiology
55
PSTB
Plant biology
32
PHFP
Plasma physics
34
JPW
Political activism
22
KCP
Political economy
131
WHB
Political humour
23
JPHL
Political leaders and leadership
46
JPL
Political parties and party platforms
22
JPA
Political science and theory
32
JPH
Political structure and processes
26
JPHV
Political structures
47
JP
Politics and government
70
RNP
Pollution and threats to the environment
43
PDZM
Popular and recreational mathematics
118
WNX
Popular astronomy and space
819
VFD
Popular medicine and health
25
QDX
Popular philosophy
21
QDXB
Popular philosophy: Meaning of life
36
VSP
Popular psychology
298
PDZ
Popular science
464
JBFC
Poverty and precarity
21
JPWG
Pressure groups, protest movements and non-violent action
37
URD
Privacy and data protection
39
PBT
Probability and statistics
261
TDCX
Process engineering technology and techniques
21
TGP
Production and industrial engineering
45
UMX
Programming and scripting languages: general
120
UMA
Programming techniques
38
JMAF
Psychoanalytical and Freudian psychology
24
JMA
Psychological theory, systems, schools and viewpoints
26
JM
Psychology
72
JMQ
Psychology: emotions
30
JMT
Psychology: states of consciousness
43
JMS
Psychology: the self, ego, identity, personality
32
MKGW
Psychopharmacology
39
JPP
Public administration
43
KFFD
Public finance and taxation
54
MBN
Public health and preventive medicine
79
GPSD
Quantitative research methods
20
PHQ
Quantum physics (quantum mechanics and quantum field theory)
1018
JBFA1
Racism and racial discrimination
32
PBKB
Real analysis, real variables
42
MFGG
Regional physiology
25
PHR
Relativity physics
354
QRAM2
Religion and politics
24
QRAM3
Religion and science
27
DNP
Reportage, journalism or collected columns
77
GPS
Research methods
103
RNKH2
Restoration ecology
21
NHTV
Revolutions, uprisings, rebellions
24
TJFM1
Robotics
329
KJS
Sales and marketing
51
KJMV7
Sales and marketing management
47
UFLS
SAP (Systems, applications and products in databases)
24
FLU
Science fiction: aliens
77
FLW
Science fiction: space exploration
200
FLS
Science fiction: space opera
35
PDK
Science funding and policy
72
PD
Science: general issues
66
PDM
Scientific research
64
WNCS1
Sea life and the seashore: general interest
25
NHWR7
Second World War
62
VS
Self-help, personal development and practical advice
35
CFG
Semantics, discourse analysis, stylistics
34
GTD
Semiotics
65
PSAN4
Sensory and motor systems
23
PBCH
Set theory
21
TJKH
Signal processing
35
NHTS
Slavery, enslaved persons and abolition of slavery
28
JHMC
Social and cultural anthropology
22
NHTB
Social and cultural history
89
JBF
Social and ethical issues
39
QDTS
Social and political philosophy
86
JBFX
Social attitudes
22
JBFA
Social discrimination and social justice
20
JBFZ
Social forecasting, future studies
50
RNT
Social impact of environmental issues
50
JMH
Social, group or collective psychology
85
CFB
Sociolinguistics
38
VSS
Soft skills and dealing with other people
27
UMZ
Software Engineering
102
UMZT
Software testing and verification
33
THVS
Solar power
223
PGS
Solar system: the Sun and planets
343
TTDX
Space exploration
550
TTD
Space science
278
CBP
Speaking in public: advice and guides
26
DNS
Speeches
45
PHS
Statistical physics
77
PBWL
Stochastics
52
RNU
Sustainability
65
TVF
Sustainable agriculture
27
JNU
Teaching of a specific subject
30
TB
Technology: general issues
28
ATJ
Television
41
ATJS
Television: styles and genres
20
ATD
Theatre studies
26
PGC
Theoretical and mathematical astronomy
78
AMA
Theory of architecture
28
ABA
Theory of art
55
AVA
Theory of music and musicology
26
PHH
Thermodynamics and heat
36
PGZ
Time (chronology), time systems and standards
47
PBP
Topology
41
RPT
Transport planning and policy
22
RPC
Urban and municipal planning and policy
72
UYZG
User interface design and usability
21
MBNK
Vaccination
32
KNDR
Vehicle and transport manufacturing industries
21
RBC
Volcanology and seismology
39
RNH
Waste management
22
PHDS
Wave mechanics (vibration and acoustics)
43
UGB
Web graphics and design
27
UMW
Web programming
104
JKSB
Welfare and benefit systems
21
WNCF
Wildlife: mammals: general interest
29
THVW
Wind power
33
CBW
Writing and editing guides
28
PSV
Zoology and animal sciences
22
The Era of Man-Made Elements
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Test : Wolverine, c'est pas ouf... Erreur de casting pour Insomniac ?
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Starthèse Meeting 2026: conference by Flavien Chervet
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