The Foldscope brings a powerful science tool to schools that can't afford microscopes. Scientists use it too. Its creators ...

In aquaria, the most common source of silt is sand — unless cleaned scrupulously well ... On the glass, my guess is that the silt is sticking to diatoms. Try wiping down the glass with a sponge before ...

Abstract % We show that codimension one distributions with at most isolated singularities on certain smooth projective threefolds with Picard rank one have stable tangent sheaves. The ideas in the ...