What is the gravitational constant?
What is the gravitational constant, how do scientists measure it, and is it really constant or can it change across time and space?
from Space https://ift.tt/68YEPzU
from Space https://ift.tt/68YEPzU
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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