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TIL There exists a mathematical concept of “negative zero”

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0wJdR TIL the pocket calculator, patented in 1967, was one of the earliest uses of rechargable batteries. One of the creators, Jerry Merryman, saw it not just as a pocket calculator, but as an "electionic revolution," bringing buttons, thermal printing, and rechargable batteries to the forefront.
9wY1p Today I learned about Maslow's hierarchy of needs, a theory in psychology often depicted as a pyramid. They are physiological (food and clothing), safety (job security), love and belonging needs (friendship), esteem, and self-actualization.
dDe8Z TIL that Judge Judy settled pet dispute by setting the dog free in court to choose his person
D1r4J TIL Keanu Reeves once rescued a pre-fame Octavia Spencer after she was stranded on the roadside
bo6a TIL that professor David Nutt (psychiatrist and neuropsychopharmacologist), and the U.K.’s Chief Advisor on Drugs Policy, was sacked in 2009 when all his research proved that ecstasy and weed were less dangerous than alcohool and tobacco.