Over 99% of Earth's 5 billion species are extinct. Current species range from 10-14 million, with 1.2 million documented. Estimated 1 trillion species exist, with only 1% described. Marine microbial species could number 20 million
Lampreys are jawless fish with funnel-like sucking mouths. There are about 38 extant species and seven extinct ones. They have four eyes and a unique cartilaginous skeleton. Adult lampreys can reach up to 1.2 meters in length
Macaques are Old World monkeys with 23 recognized species. Males range from 41-70 cm and 5.5-18 kg, females from 2.4-13 kg. They have brown or black fur, rounded muzzles, and varying tail lengths. Males dominate social groups, females maintain longer dominance
Five stages: fresh, bloat, active decay, advanced decay, and dry/skeletonized. Fresh stage shows algor mortis, rigor mortis, and livor mortis. Bloat stage involves anaerobic bacterial growth and foul-smelling gases. Active decay features maggot development and insect activity. Advanced decay shows complete putrefaction and discoloration
Kissing triggers dopamine, oxytocin, and serotonin release. Heart rate increases and blood pressure lowers during passionate kisses. Sweating and flushed cheeks are natural reactions. Pupil dilation indicates mutual attraction
Approximately 56% of information is forgotten within an hour. Brain's capacity to store and recall details is limited. Forgetting can occur suddenly or gradually