The touch-me-not plant (Mimosa pudica) closes its leaves when touched and remembers the stimulus for weeks.

Some trees can communicate with each other using underground fungal networks.

Tahini, made from sesame seeds, contains more calcium per tablespoon than a glass of milk.

The rainbow eucalyptus tree naturally sheds bark in patches, revealing bright green, blue, purple, and orange layers beneath.

Volcanic lightning is caused by static electricity from ash particles colliding during eruption.

The sandbox tree (Hura crepitans) explodes when ripe, flinging seeds up to 45 meters at over 70 km/h.

Humans have a vestigial muscle called the palmaris longus that once helped ancestors climb trees — about 14% of people lack it.

The deepest cave ever explored is Veryovkina Cave in Georgia — descending 2,212 meters below ground.

Volcanic ash can damage engines and machinery.