People have painted on cave walls and written on clay and wax tablets, papyrus and paper made from wood. Could screens replace paper someday?
Franklin Delano Roosevelt, standing at center and facing left just above the eagle, takes the presidential oath of office for the third time in 1941.
FDR Presidential Library and Museum via Flickr
Everest didn’t become the highest mountain overnight. This process was excruciatingly slow; a result of complex interactions between the solid earth, the atmosphere and the biosphere.
There are so many different states – and provinces, districts, regions and lander!
Getty Images
The U.S. is broken up into 50 states, plus territories like Puerto Rico and Guam, and a federal district, Washington, D.C. Most other countries have smaller parts too.
The sky can be so many different things: it can be big, beautiful and blue, or grey, cloudy and rainy. It can also be full of stars, or full of orange and red clouds at sunset or sunrise.
(Shutterstock)
Humans are constantly changing our languages in terms of sounds, words, meanings, and grammar, so much so that it becomes increasingly difficult to understand our own distant relatives across time and space.
(Unsplash/Lucrezia Carnelos)
Even if every human being on Earth went for a dip in the ocean at the same time, they’d be just a drop in the bucket compared to the size of the planet’s seas.
Going to the bathroom is much more complicated in space without any gravity. To solve this problem of tricky orbital potty breaks, NASA builds special toilets that work without gravity.
If octopuses simply started evolving a smarter brain, what stops them from ruling over humans? Why has this not happened already? An expert explains what these cephalopods might be capable of.