NASA astronaut Mark Vande Hei looks down at the ground inside the seven-window of the International Space Station

If an apple falls, then does the moon also fall?By Isaac Newton.led to the theory of gravity How do organisms transmute information about their features over a thousand generations?By Charles Darwinled to the theory of evolution How does a single...

As far as we know, the universe is made up of fundamental particles like electrons and quarks. Everything we see in the universe, including ourselves, is the result of interactions between these particles. Fundamental forces mean interactions of elementary particles....

Pak is a pet fish that resembles a piranha. Although native to South America, Pak is a popular breed around the world. Pacu is the oldest word in the Tupi-Gorani language of South America. The word means 'fast eaters'. The...