Penis
Domestic cats have barbed penises, with about 120–150 one millimeter long backwards-pointing spines. Upon withdrawal of the penis, the spines rake the walls of the female's vagina, which is a trigger for ovulation. Lions also have barbed penises. Male felids urinate backwards by curving the tip of the glans penis backward. When male cheetahs urine-mark their territories, they stand one meter away from a tree or rock surface with the tail raised, pointing the penis either horizontally backward or 60° upward.
Fetal EEG
The youngest fetus that Borkowski and Bernstine studied was between 43 and 45 days post-conception – only 16mm long. At 45 days after conception, the brain is bent forward and is almost as large as the entire body of the fetus, allowing for these deep recordings. The 45-day old fetus’s electrical signals resembled the “discontinuous” patterns observed in healthy newborns, premature infants, and fetuses in the last trimester of pregnancy. The doctors also observed patterns that resembled “sleep spindles” in adults. The scientists continued recording until they consistently observed patterns of brain death, since the fetuses could not survive outside the uterus.