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An insight into a microscopic world, invisible to the unaided human eye

Why do leaves change color in Fall? Learn why leaves change color and fall off the trees in autumn. Plus, get great science projects.

Pea aphids may have an unprecedented ability to harvest sunlight, and use the energy for metabolic purposes. It would make it the only species of animal known to have photosynthesis-like powers.

The surface of plants (with a few exceptions, such as those that live submerged under water) is covered with a tough, transparent, waxy layer called the cuticle, composed of cutin secreted by the layer of epidermal cells that it covers. The best way to see the cuticle is to snap the leaf of a drought-adapted succulent plant like Crassula ovata and pull one part of the leaf against the other, peeling away the cuticle, which covers the above ground parts like a wrapping of cling-film. These…

HST's leaf chromatography experiment reveals hidden colors in green leaves and lets you predict their fall colors. Learn about pigments and chlorophyll now!

How photosynthetic organisms get taken up, passed around, and discarded throughout the eukaryotic domain

An arrangement of autumn leaf colours. This colour change is a phenomenon that affects the normally green leaves of many deciduous trees and shrubs by which they take on, during a few weeks in the autumn season, one or many colours that range from red to yellow.

We've all heard the saying, "the grass is always greener on the other side" but it turns out that the grass is actually always greener where it gets the mo

Why do leaves change color in Fall? Learn why leaves change color and fall off the trees in autumn. Plus, get great science projects.

Learn how to separate plant pigments using paper chromatography. Experiment with different leaves to see the wide range of pigments!

These green blobs are chloroplasts - in this instance packed inside the cells of a moss leaf and magnified around 400 times - upon which our collective future depends. Using only energy from sunlight, water and carbon dioxide from the atmosphere, they produce the oxygen we breathe, control the climate by removing carbon dioxide from the atmosphere and, directly or indirectly via plants and animals, produce all the food we eat. Currently 6.3 billion of us depend on them for our survival. By…