I feel optimistic about the future because humanity seems to be growing more mature; scientists are paying more attention to our inner values, to the study of mind and the emotions. There is a clear desire for peace and concern for the environment.

How Eratosthenes measured the size of Earth: the Cosmos episode where Carl Sagan explains how the ancient Greeks, using reason and math, figured out the Earth isn’t flat, over 2,000 years ago bit.ly/2C15z8A

WWI reconnaissance pigeon, 1915.

It's not looking good for planet Earth. futurism.com/expert-warning…

The story of how aluminum, once the most precious metal on the planet, transformed from scarcity to #abundance: bit.ly/2slfHbK

Michelangelo's 16th century grocery list. He illustrated it because the servant was illiterate. Casa Buonarroti.

"The real problem of humanity ... we have Palaeolithic emotions; medieval institutions; and godlike technology." -E. O. Wilson

Our monuments are under "review" by Trump, Secretary Ryan Zinke please listen to #TeddyRoosevelt's words on #MonumentsForAll & #OurWild

Plastic bags are among the most common types of marine litter. By making informed choices and choosing to use a reusable bag, you can #BeatPlasticPollution . Learn what else you can do here: bit.ly/2GjmExb