But exactly how catnip—and a substitute, known as silver vine—produce this feline high has long been a mystery. Now, a study suggests the key intoxicating chemicals in the plants activate cats’ opioid systems much like heroin and morphine do in people.

a barbicaned gate

This is what I take seriously / My life that lives within me / Lives within me just as I / Live and breathe

Thin section photograph of foyalite (peralkaline phonolite) from Sevrano ki Dhani.