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AstronomyImages of a fiery youth
A faint, infrared glow captured by the Spitzer Space Telescope might be light from the universe's first stars.
By Ron Cowen -
Planetary ScienceMars or Bust!
Scientists are working to overcome the biomedical challenges that would hinder a human voyage to Mars.
By Katie Greene -
Health & MedicineStaring into the Dark
Amid a growing array of medications for treating insomnia, sleep researchers point to large gaps in their knowledge about which of these medicines work best and for how long they remain effective.
By Ben Harder -
MathProblems to Sharpen the Young
Medieval brainteasers have kept students and other people puzzled and entertained for centuries.