nitrogen
gregladen | March 27, 2012There is a spreading belief that if you put Nitrogen (instead of regular air) in your car tires, that you will get better gas mileage. The reasoning behind this may be sound, but the facts on which the reasoning is based are not correct. Therefore, the answer is no, it is not advantageous for the average person to use Nitrogen in their car tires. On even more detailed examination, it maybe that regular air is better than Nitrogen for most people. Nitrogen is in fact used in certain tires, and there may be a good reason for that, though the information I have is probably missing something…
sastyk | October 16, 2011From Yale Environment 360, more questions about future UN population projections:
For now, we can indeed be highly confident that world population will top 7 billion by the end of this year. We're close to that number already and currently adding about 216,000 people per day. But the United Nations "medium variant" population projection, the gold standard for expert expectation of the demographic future, takes a long leap of faith: It assumes no demographic influence from the coming environmental changes that could leave us living on what NASA climatologist James Hansen has dubbed "a…
awild | November 22, 2009
Sericomyrmex ants in a laboratory fungus garden
The textbook version of the leafcutter ant and its fungus is a simple story: attine ants cultivate an edible fungus in their nests. They are obligate farmers, eating only the fungus, and the fungus is a specialized cultivar found only in ant nests.
It's a nice tale, but as researchers probe deeper they continually uncover just how complex the ant-fungus interaction is. For example, about a decade ago Cameron Currie discovered that ants employ bacterial antibiotics to keep the garden clean of diseases. Microbes, too, are integral to the…
edyong | November 21, 2009
Hardly a natural history documentary goes by without some mention of leafcutter ants. So overexposed are these critters that I strongly suspect they're holding David Attenborough's relatives to ransom somewhere. But there is good reason for their fame - these charismatic insects are incredibly successful because of their skill as gardeners.
As their name suggests, the 41 species of leafcutter ants slice up leaves and carry them back to their nests in long columns of red and green. They don't eat the leaves - they use them to grow a fungus, and it's this crop that they feed on. It's an old…