“This Simple Philosophical Puzzle Shows How Difficult It Is to Know Something”

“thinkers for thousands of years had more or less taken one definition for granted: Knowledge is “justified true belief.”…

The trick, Pritchard says, is first to notice…

“A Race to Save the Orange by Altering Its DNA”

“Oranges are not the only crop that might benefit from genetically engineered resistance to diseases for which standard treatments have proven elusive. And advocates of the technology say it could also help provide food for a fast-growing…

“World’s languages traced back to single African mother tongue”

“New research, published in the journal Science, suggests this single ancient language resulted in human civilization — a Diaspora — as well as advances in art and hunting tool technology, and laid the groundwork for all…

“Why whales grew to such monster sizes”

“Next, Slater and his colleagues checked to see what was happening in the world at the time to cause the change. They found that the baleen whales’ growth spurt coincided with the beginning of the first ice ages. As glaciers expanded, spring and summer runoff…