Although English Scientist Robert Hooke described a honeycomb-like network of cellulae (Latin for little storage rooms) in cork slice using his primitive compound microscope, the first man to clearly observe a live cell under a microscope was Anton van Leeuwenhoek, who in 1674 described the algae Spirogyra.
Forensic scientists collect, preserve, and analyze scientific evidence during the course of an investigation. While some forensic scientists travel to the scene to collect the evidence themselves, others work from a laboratory, performing analysis on objects brought to them by other investigators.
The Holocene extinction, otherwise referred to as the Sixth extinction, is the ongoing extinction event of species during the present epoch (beginning approximately 10,000 BC) mainly due to human activity. The present rate of extinction may be up to 140,000 species per year, making it the greatest loss of biodiversity since the Cretaceous-Paleogene extinction event.
The many-worlds interpretation implies that all possible alternate histories and futures are real, each representing an actual "world" (or "universe"). In layman's terms, the hypothesis states there is a very large--perhaps infinite--number of universes, and everything that could possibly have happened in our past, but did not, has occurred in the past of some other universe or universes.