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Is the causal relationship between mood and immune system response so obvious? Could not a healthier immune system cause a more positive outlook, rather than the other way around? Lester WelchAiken, S.C.
- Astronomy
Comet Sampler: Specimens show that inner and outer solar system mixed
Just as the solar system was forming some 4.6 billion years ago, some of the hottest material, residing so close to the sun that it was almost vaporized, sped out to the chilliest reaches of deep space, where it became incorporated into comets.
- Health & Medicine
Express delivery for cancer drugs
A new drug-delivery method has dramatically reduced tumors in experiments conducted with mice.
