what what

life:

A pair of 90-day-old cow fetuses are clearly visible inside the amniotic sac in this beautifully eerie photo from 1965 — The micrometer at the shriveled end of the sac measures a lump that contains a dead fetus. (For a better sense of the scale of the sac, notice the fingers holding the micrometer at the top.)

(see more — LIFE’s 37 Best Science Photos)

(via mudwerks)