Science

One gram of DNA can theoretically hold 215 petabytes — roughly 200 million movies. Its four bases act as a base-4 storage medium. In 2017, George Church's Harvard team stored a short film and images in DNA and retrieved them without errors. Properly stored, DNA can last millennia.

Marie Curie's notebooks remain in lead-lined boxes 90+ years after her death — still dangerously radioactive. Soaked in radium and polonium she handled bare-handed, readers must sign a waiver and wear protective gear. Radium's half-life is 1,600 years.

Earth's magnetic field has flipped hundreds of times; the last reversal was about 780,000 years ago. During reversals the field can weaken to under 10% of today’s strength, letting auroras appear near the equator. Since 1840, Earth’s field has already weakened by about 9%.

Researchers found 33 ancient viruses in a Tibetan glacier core, about 15,000 years old. 28 were new to science. Because ice can preserve microbes and viruses for millennia, melting glaciers may expose long-frozen microorganisms to today's environment.

In the 1920s, Soviet biologist Ilya Ivanov tried to create a "Humanzee," a human-chimpanzee hybrid. All experiments in Africa and the Soviet Union failed. Modern genetics confirmed this is impossible: humans have 23 chromosome pairs, chimpanzees 24.

In 2004, physicist Andre Geim discovered graphene by peeling scotch tape off graphite during a casual Friday evening experiment. This "dream nanomaterial"—200 times stronger than steel and 100 times more electrically conductive than copper—earned him the Nobel Prize in 2010.

The "photic sneeze reflex," nicknamed ACHOO syndrome, causes people to sneeze when suddenly exposed to bright light. It's surprisingly common—affecting 18–35% of Americans and about 25% of the Japanese population.

Pure water is an insulator. Electricity passes through water not because of the water itself, but because of dissolved ions. Tap water conducts electricity well because it contains ions like chlorine from disinfection.