“Placental mammals that gestate their young internally, as do we and most of the pelts we know,…”

“Placental mammals that gestate their young internally, as do we and most of the pelts we know, account for 95 percent of the world’s 5,600 species of mammals, and marsupials like the kangaroo, koala and our very own opossum, whose young are born at a grublike stage and do most of their developing externally, often in a pouch, constitute nearly all the rest.”

Actually I think humans are born in a grublike state too. A Gene Map for the Cute Side of the Family – New York Times

“Placental mammals that gestate their young internally, as do we and most of the pelts we know, account for 95 percent of the world’s 5,600 species of mammals, and marsupials like the kangaroo, koala and our very own opossum, whose young are born at a grublike stage and do most of their developing externally, often in a pouch, constitute nearly all the rest.”

Actually I think humans are born in a grublike state too. A Gene Map for the Cute Side of the Family – New York Times

It does seem like big discoveries could be under every stone, behind every tree… I can imagine…

It does seem like big discoveries could be under every stone, behind every tree… I can imagine demonstrating revolutionary concepts to people in 1600 AD or to Aristotle, using simple items like string, weights, rubber balls (did they have rubber?). For example, many thought that firing an arrow upwards would result in the arrow landing far to the east if the earth turned… that could be disproved simply by bouncing a ball in place on a moving platform, like a ship. Does that mean that there are other breakthrough discoveries all around us, easy to demonstrate with household objects, if only we understood what their behaviors meant?

It does seem like big discoveries could be under every stone, behind every tree… I can imagine demonstrating revolutionary concepts to people in 1600 AD or to Aristotle, using simple items like string, weights, rubber balls (did they have rubber?). For example, many thought that firing an arrow upwards would result in the arrow landing far to the east if the earth turned… that could be disproved simply by bouncing a ball in place on a moving platform, like a ship. Does that mean that there are other breakthrough discoveries all around us, easy to demonstrate with household objects, if only we understood what their behaviors meant?