Letters to the Editor

Readers ask about positronium, wild bees and more

Readers ask about exoplanets, spider silk and water beetles

Readers ask about Microraptors, an X-ray map of the sky and more

Readers ask about neutrinos in the sun’s core, megaflashes and mussels

Readers ask about Mars dust storms, Fermi bubbles and more

A reader asks about coronavirus mutations

Readers ask about antibody tests, chimeras and public health and privacy

Readers ask about exoplanet heating sources, combating climate change and COVID-19

Readers ask about the size of the Milky Way, ancient rainforests and COVID-19

Readers ask about dust in space, playgrounds, and COVID-19

Readers ask about satellite traffic jams and coronavirus

Readers ask about bat viruses and coronavirus