Why do stars twinkle?
Stars appear to twinkle because the light from these distant objects passes through wobbly air in the atmosphere.
from Space https://ift.tt/z64RhEp
from Space https://ift.tt/z64RhEp
New method to detect and visualize sperm cells recovered from forensic evidence
One of the most valuable forms of forensic evidence in cases of male-perpetrated sexual assault is the presence of semen, either in the form of stains left behind on items or on swabs collected from victims after an offense. To confirm that semen is present, suspected stains are examined under a microscope to see if any sperm cells are visible. from Phys.org - latest science and technology news stories https://ift.tt/2XBwacB
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