A wheel turns because of its encounter with the surface of the road; spinning in the air it goes nowhere. Rubbing two sticks together produces heat and light; one stick alone is just a stick. In both cases, it is friction that produces movement... Zobraziť viac
What a rare mushroom can teach us about sustaining life on a fragile planet Matsutake is the most valuable mushroom in the world-and a weed that grows in human-disturbed forests across the northern hemisphere... Zobraziť viac
