The natural opioid kratom, the leaves of a tropical tree in Southeast Asia (Mitragyna speciosa) is a great analgesic because it's an opioid.  It has become popular because supplements are exempt from government oversight unless companies are causing people to fall over, which has happened - they seized 90,000 bottles of it in 2016 and want to ban its importation due to concerns about safety.

Grasses have been able to short cut evolution by taking genes from their neighbors, finds a new study.

Since Darwin, much of the theory of evolution has been based on common descent, where natural selection acts on the genes passed from parent to offspring. But sometimes what seems to be natural selection is really artificial, like lateral gene transfer that allows organisms to bypass evolution and skip to the front of the queue by using genes that they acquire from distantly related species. Even by stealing them.

Fossilized eggshells unearthed in western Romania represent the earliest known nest site shared by multiple animals. The shells – some complete and others broken into thousands of pieces – are densely packed and encased in mudstone which formed part of the remains of a bird breeding colony, probably comprising hundreds of seperate nests. 

Now in the collections of the Transylvanian Museum Society in Cluj Napoca, Romania, the samples date from the late-Cretaceous period (approx. 70 million years ago) and were discovered near the city of Sebeş in Transylvania by local palaeontologist Mátyás Vremir about nine years ago.

In the comics and films, Clark Kent wore reading glasses while Superman had no glasses but sported a lock of hair on his forehead - and no one figured it out. Ridiculous, it was later said.

Perhaps it was ridiculous if keen reporters who knew Kent well did not figure it out, but for the most part even subtle disguises work well for most people, according to a new study. Something as minor as complexion changes or a hairstyle are enough to convince people that in a world of six billion people, a one in a million chance of seeing a person who looks like someone you know is not that bad.

Cockroaches have a reputation for resilience, likely contributing to the belief that they could even survive a nuclear bomb and subsequent radiation exposure.

And though Fukushima was not a nuclear bomb, or even a real disaster (more people died trying to escape than from radiation), the claim that cockroaches were found led weight to their constitutions.(a) But is it really accurate? In the future, if a disgraced doctor finds Alita: Battle Angel in a junk pile, will she be with a cockroach? 

In vitro, in utero, these are science terms that have become commonly known. In vitro means studies in cells, like using test tubes, or a test for a fetus in the womb in the case of in utero.

Studies done in feces - yes, excrement - haven't really had a name, they though are common in gut bacteria analyses. Now they might, thanks to UNC School of Medicine scientist Aadra Bhatt, PhD, and colleagues; in fimo. Their proposal is published in the journal Gastroenterology.