The numerous nutrition guidelines promoted by the U.S. federal government are obeyed by just 2 percent of Americans. If only 2 percent of any population can obey your guidelines, they are a nutritional wishlist created by groups of experts promoting their diet fads, not evidence-based information.

However, one group is constantly criticized by everyone else - pregnant mothers - and a new study shows that no pregnant women in any demographic are able to achieve the Dietary Guidelines for Americans. Which means those guidelines are irrelevant, not that expectant moms need even more criticism.

A new paper claims the size and shape of your nose evolved in response to local climate conditions. 

The nose is one of our distinctive facial features. It conditions the air we breathe so it is warm and moist when it reaches the lungs, which helps prevent infections. And that may be why people whose ancestors lived in hot, humid places tend to have wider nostrils than people whose ancestors came from cold and dry environments.

ECHA, the European Chemicals Agency, has released findings from its Committee for Risk Assessment (RAC) which concluded that glyphosate (e.g. Roundup, by the agriculture company Monsanto, though it's been off-patent for 17 years) is not a carcinogen, nor is it a mutagen, nor is it toxic for reproduction.

By using lasers to manipulate a superfluid gas known as a Bose-Einstein condensate, the team was able to coax the condensate into a quantum phase of matter that has a rigid structure — like a solid, and can flow without viscosity, a key characteristic of a superfluid.  Basically, they have created a supersolid, a new form of matter which combines the properties of solids with those of superfluids. 

Isn't that a contradiction? 

“It is counterintuitive to have a material which combines superfluidity and solidity,” says team leader Wolfgang Ketterle, the John D. MacArthur Professor of Physics at MIT. “If your coffee was superfluid and you stirred it, it would continue to spin around forever.”

Metabolism, the set of processes through which we gain energy from food and produce the biomolecules we need in our body's cells, is universal to life. The biochemical pathways that underpin these processes are highly similar across all organisms and species. 

To the outside world, muscles look like they contract or do work but at the very small scale it is
myosin molecules pulling actin filaments and myosin and actin are essentially nanomachines that convert the chemical energy of ATP hydrolysis - how cells in our muscles create energy - into mechanical work.

New electron cryomicroscopy images reveal unexpectedly large conformational changes in the myosin molecule during the pull and that may show how myosin generates force and create a paradigm for the construction of true nanomachines.