Biologists like to say that reproduction is the ultimate investment, a costly gamble that shapes everything from lifespan to ...

By studying genetic data from nearly 140,000 IVF embryos, scientists have with unprecedented detail revealed why fewer than ...

Epaulette sharks reproduce effortlessly, without using much energy. The epaulette sharks, also known as “walking sharks,” do not have a rise in energy use during their reproduction cycle, according to ...

Teresa Sanchez was in Mexico for a medical procedure nearly four years ago when she kept feeling dry, poking sensations in her right eye. She chalked it up to a potential rip in her contact lens, the ...