These Tiny, Beautiful Wasps Eat the Hearts Out of Cockroaches

Amy Silverstein, Who Chronicled a Life of Three Hearts, Dies at 59

Stanford bioengineers aim to build a heart, one layer at a time Using advanced 3D printing techniques, Mark Skylar-Scott and his team want to transform a paste made of living cells into hearts and other organs.

A graphene “tattoo” could help hearts keep their beat