To suggest topics or sites for Web Watch, please visit Compiled and edited by Charles Day

How humans have observed and made sense of the cosmos is the subject of Cosmic Journey: A History of Scientific Cosmology, the latest online exhibit from AlP's Center for History of Physics.

From the US Geological Survey comes WaterWatch, an interactive map that displays data from a network of streamflow monitors in the US. By clicking on a state, you see how the day's streamflow compares with the historical average at each of the state's monitoring points.

The extensive set of tutorials on Sean McHugh's website Cambridge in Colour provides science-based advice on taking better digital photographs. McHugh's forte is long exposures under dim lighting conditions.

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