The cover shows the moth Idalus iragorri, one of many insect species found at low to medium elevations in the eastern Andes. More than 70% of all insect species are found in the tropics, but the ...

Colloids are particles that have a diameter of between approximately 1 and 1,000 nanometres and that are evenly dispersed in fluids. Colloids are also known as colloidal dispersions because the ...