Rhubarb leaves contain oxalic acid and are poisonous if eaten in large quantities.

Durian, the 'king of fruits,' is banned from many public places in Southeast Asia due to its pungent odor.

Crows can remember individuals who previously threatened them.

Brie and Camembert are both soft-ripened French cheeses but develop their rinds from different Penicillium mold strains.

The 1883 eruption of Krakatoa created global atmospheric effects.

A beaver builds dams to create ponds.

The avocado requires a 'pollinator paradox' — its flowers are male and female at different times to prevent self-pollination.

The Great Wall of China used rice flour mixed into the mortar — the sticky carbohydrate strengthened the bonds.

Cashews always come roasted because raw cashews contain urushiol, the same toxin as poison ivy.