HOME
Technology
Life
Discover science
Medicine - Health
Event
EntertainmentThe 10 cleanest capitals in the world
Plans to limit pollution and green spaces have helped many capitals around the world to have a clean atmosphere and an ideal place to live or travel.Tallinn's historic center
Unesco's Scientific, Educational and Cultural Organization has recognized the Historical Center of Tallinn, the Estonian Republic as the World Cultural Heritage in 1997.
Latest update
- Why are diesel engines not used in small cars?
- Why does every lock have a 'mysterious' small hole at the bottom?
- Why is Mount Everest so attractive to so many people?
- Why will the Earth never be 'swallowed' if one day the Sun turns into a black hole?
- Record selling price for the gold watch of the richest passenger on the Titanic
- Humans' heat tolerance limit is not as high as we think
- Atomic clocks are off by only 300 trillionths of a second every day
- China wants to bring Mars samples before the US
Why are diesel engines not used in small cars?
Why does every lock have a 'mysterious' small hole at the bottom?
Why is Mount Everest so attractive to so many people?
Why will the Earth never be 'swallowed' if one day the Sun turns into a black hole?
Record selling price for the gold watch of the richest passenger on the Titanic
Humans' heat tolerance limit is not as high as we think
Atomic clocks are off by only 300 trillionths of a second every day
China wants to bring Mars samples before the US
Useful software
New technology
Science invention
Computer science
AI - Artificial intelligence
Scientific application
Environment
Animal world
Biology
Alien
Doomsday
History
Space science
Archeology
Oceanography
World Heritage
World celebrity
Conquer Mars
1001 mystery
Health
Antibiotic resistance
Flu epidemic
Cancer
Food safety
Science Events
Scientific works
Science story
Videos
Photo library
Funny corner