Articles by Tabitha Powledge

There's more evidence that neurogenesis occurs in the human olfactory bulb, but what do these new neurons actually do?

Archaeologists uncover more evidence of tiny human-like creatures; experts still at war over interpretation

Pamela Flood says she's very excited about nicotine.

People have used marijuana and its derivatives to relieve pain as well as get high for thousands of years.

Endocast studies suggest that overall brain shape of Homo floresiensis resembles Homo erectus

Handover is unlikely to resolve scientific and ethical issues over Homo floresiensis

Paleoanthropology is among the most quarrelsome of fields, so it is no surprise that researchers have gone to war over the remarkable bones discovered in a Liang Bua cave on the Indonesian island of Flores in 2003.

Tammy Irvine, http://www.rearviewstudio.comBig, loud, and astonishingly clumsy, periodical cicadas dally underground for nearly their entire long lives (17 or sometimes 13 years) and then emerge all at once by the millions, in May, when the soil has warmed to the mid-60s. The males form choruses in the trees, belting out love songs loud enough to damage human hearing. Each female selects just one troubadour, mates, and lays her eggs in twigs; then all the adults die. The process takes only three

© Chris Simon, University of ConnecticutTwo cicadas mate.It's a bit tricky, getting a tiny drop of Super Glue in exactly the right place on a cicada's thorax. Martin Wikelski must affix his microtransmitter far enough forward so that it doesn't interfere with her wings, because her wings, and how far she flies with them, are why Wikelski, a physiological ecologist at Princeton University, is spending a cloudy May morning watching ungainly red-eyed insects struggle out of their exoskeletons

Privately funded 5-year US trial will test effects of early estrogen

New resource emphasizes need for multiple genomic datasets to increase clarity

Figure 1CAUSE FOR CONCERNPhysicians wrote more than two million prescriptions for HRT in 2003. Many were for off-label use, intended to revive testosterone levels that wane with age."Fatigued? Depressed mood? Low sex drive? Could be your testosterone is running on empty." This Web sales pitch1 comes not from one of the myriad disreputable companies peddling 21st-century snake oils such as "Libido Enhancement Cream." Rather, the site belongs to Solvay Pharmaceuticals, Marietta, Ga., which produc

Report urges multiple containment systems for engineered animals and plants

The more, the merrier, researchers declare. Is the sky the limit?

 A COMPOUND SCREEN:Screening strategy used to (A) identify mechanistically distinct antiprogestins and (B) to identify estrogen receptor (ER)-sparing antiprogestins.Click for larger version of diagram (33K) Progestins, synthetic progesterone analogs, joined estrogen as part of hormone replacement therapy (HRT) some two decades ago, to reduce perceived risks of endometrial cancer from estrogen alone. But for almost as long, researchers have suspected that progestins block some benign effec