Sperm wars: Evolutionary biologist compiles international special issue on sperm competition
Why do male animals need millions of sperms every day in order to reproduce? And why are there two sexes anyway? These and related questions are the topic of the latest issue of the research journal Molecular Hu ...
Population density and testes size: More than meets the eye
A team of researchers has discovered that changes in population density can affect the size of animals' testes and therefore impact on reproduction.
Study brings greater clarity to sex roles
Glossy magazines and TV reality shows often portray males as the gender that strays and females as the gender that's picky.
Big sperm don't always win the race
When females mate with more than one male, each one's sperm has to compete to get to her eggs. Until now, researchers had thought the fastest sperm would dominate.
Ex-Nokia engineers launch new smartphone (Update)
Engineers who used to work for Nokia are hoping to grab a share of the lucrative and highly competitive smartphone market with a new handset, which is based on the former world No. 1 cellphone maker's old ...
Study of salmon sperm success shows need for speed
(Phys.org) —When salmon spawn, males competing to fertilise eggs will win or lose based primarily on their sperm swimming speed, according to a collaborative study by researchers from the University of ...
Females fight back in sperm wars
(Phys.org) —Females exposed to a risk of sperm competition have been found to produce more defensive ova compared to the eggs of females reared under no risk of sperm competition, according to researchers ...
Doing it to death: Suicidal sex in 'marsupial mice'
Imagine if you only had one shot at passing on your genes before you died. It happens more often in the natural world than you might expect: suicidal reproduction – where one or both sexes of a species ...
Biologists confirm role of sperm competition in formation of new species
Female promiscuity—something that occurs in a majority of species, including humans—results in the ejaculates from two or more males overlapping within her reproductive tract. When this happens, sperm ...
Guppies lie about mate choice to trick rivals
When it comes to sex among guppies, competition is high for those at the top of the game. To get around this predicament, a recent study has shown, guppies use trickery. ...
Apple guilty in e-book conspiracy case, vows appeal (Update)
A US judge ruled Wednesday that Apple violated antitrust law in a price-fixing case, saying the company "conspired to restrain trade" with publishers to boost the price of e-books.
German bank reports solar power cost in India and Italy has reached grid parity
New pathways in bacterial intercellular competition uncovered
(Phys.org) —There's an epic battle taking place that's not on the national radar: intercellular competition. While it's not an Olympic event, new research from UC Santa Barbara demonstrates that this microscopic ...
Gender gap disappears in school math competitions, study shows
The idea that boys are better at math and in competitions has persisted for a long time, and now we know why: Nobody bothered to schedule the rematch.