Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.

What makes plants grow to a certain size? From the tiniest cells to whole leaves, roots, and stems, growth has to be ...

Pictures of DNA often look very tidy—the strands of the double helix neatly wind around each other, making it seem like ...

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Permeation tubes and systems that dynamically generate fresh, NIST-traceable gas standards offer significant benefits for ...

Acetylation of lysine residues in the tail domain of histone H3 is well characterized, but lysine residues in the histone globular domain are also acetylated. Histone modifications in globular domain ...

Sometimes external forces in the economy throw the supply and demand for a product or service out of whack. Trade quotas are a common and powerful example of one such external force. One way ...

Check the currency rates against all the world currencies here. The currency converter below is easy to use and the currency rates are updated frequently. This is very much needed given the extreme ...