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TIL of 4-7-8 breathing (inhale 4 seconds, hold 7 seconds, exhale 8 seconds, repeat). Based on pranayama breathing exercises, this "natural tranquilizer for the nervous system" activates the body's parasympathetic nervous system (relaxation) and suppresses the sympathetic nervous system (stress).

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nW749 TIL Black wolves carry the K-locus mutation which causes their color. This gene provides greater immune defense during disease outbreaks, resulting in greater survivorship. Grey wolves, by contrast, are more aggressive during territorial conflicts.
KYRW4 TIL that Josephine Baker adopted 12 children of all skin colors, creating what she referred to as her “rainbow tribe” and her “experiment in brotherhood.” The children were all brought up in accordance with their heritage and the religions that Baker assigned to them.
NXVL6 TIL the Wayne Gretzky trade from Edmonton to the LA Kings yielded a "Trade Tree" that lasted 34 years (i.e. the players and draft picks Gretzky was traded for in 1988 spawned their own trades and draft picks over the years, with the final player leaving the NHL before this current season.)
1alDW TIL whenever a hermit crab finds a shell too big for itself it'll wait until a queue forms and an individual that fits the shell is found. Then an exchange will occur - smaller crabs will move to newly emptied shells.
5ZK8 TIL “Weird Al” Yankovic was valedictorian of his class before earning a bachelors degree in architecture.