There are few cases in the history of physics in which a particle, theoretically predicted, has been detected repeatedly and not identified as such. This is what happened to the positron. Paul Dirac showed in 1928 that it could be the case that a particle could have negative energy but a positive charge. It was […]
Can you guess the sequence of the DNA strand that is analyzed in this experiment? (Feel free to use the comments!). One does not need to be a biochemist to figure it out. Start from the bottom of the picture. Just jump from one step of the “ladder” to the next, even if it is […]
In 1907, Daniel, a miner working in Mauer, near Heidelberg (Germany), found a jaw of unequivocally human origin. The bone was a complete jaw but lacked the characteristic prominent chin of our species, Homo sapiens. The fossil was identified as the first of a new species, Homo heidelbergensis , a 600,000 year-old ancestor. The oldest […]