- In an article about Tidal Acceleration : "About 2.1 billion years from now, the continual increase of the Sun's radiation will cause the Earth's oceans to boil away, removing the bulk of the tidal friction and acceleration. Even without this, the slowdown to a month-long day would still not have been completed by 4.5 billion years from now when the Sun will evolve into a red giant and likely destroy both the Earth and Moon."

- Puerto Ricans have been included in the compulsory draft, when it has been in effect, yet Puerto Ricans residing in Puerto Rico cannot vote in the U.S Presidential election, nor are they represented by a voting U.S. Representative or Senator.

- During the American Civil War, when the state of Louisiana seceded, Winn Parish in northwest central Louisiana refused to secede, thus, in effect, seceding from the secessionist state to remain a Union enclave during the war.

- Some species of anglerfish display extreme sexual dimorphism. Females are typical anglerfish, while males are tiny rudimentary creatures with no digestive systems. The males must find a female and fuse with her – he then lives parasitically, becoming little more than a sperm-producing body. A similar situation is found in the Zeus water bug Phoreticovelia disparata where the female has a cavity on her back where males live permanently attached.

- Perfumes are classified by the concentration of perfume oil as follows:
Perfume extract (Extrait): 20%-40% (IFRA: typical 25%) aromatic compounds
Eau de Parfum (EdP): 10-30% (typical ~15%) aromatic compounds
Eau de Toilette (EdT): 5-20% (typical ~10%) aromatic compounds
Eau de Cologne (EdC): 2-5% aromatic compounds

- The now extinct passenger pigeons had one of the largest groups or flocks of any animal, second only to the desert locust. They lived in enormous flocks, and during migration, it was possible to see flocks of them a mile (1.6 km) wide and 300 miles (500 km) long, taking several days to pass and containing up to a billion birds.