Sperm quality can be reduced by several lifestyle factors, like obesity and related diseases such as type 2 diabetes, but a new examination of epigenetic phenomena - gene expression changing even if the DNA sequence is not changed -  finds that even diet can impact sperm quality, and in just two weeks.

The concern is that such epigenetic changes might be able to lead to properties being transferred from a parent to offspring via the sperm or the egg. 

Any time is a good time to start exercising but a great time to start exercising is today. Share this article on Facebook first, though. 

Don't be intimidated by those people who hiss about Crossfit or their Peloton, a new study shows you have the same ability to build muscle mass as highly trained master athletes of a similar age.

Navan Fort, the legendary capital of Ulster. has long been considered a site of ritual gatherings.  Excavations have uncovered a huge 40-yard diameter building and a barbary ape cranium, likely from at least as far as Iberiam along with remnants of pigs, cattle and sheepfrom across Ireland, perhaps being reared as far afield as Galway, Donegal, Down, Tyrone and Antrim. 

That means Iron Age communities were very mobile at holiday time, their own version of driving for Christmas. 

Light propagation usually goes both ways; it is reciprocal in that the trajectory of light traveling one direction is identical in the opposite direction.

Isolators and circulators, which make light propagate only in one direction, are vital building blocks in many modern laser and communication systems, but are almost exclusively based on the magneto-optic effect, making devices bulky and difficult for integration. A magnetic-free route would be a great breakthrough for many optical applications. 

The CDC has updated its fatality and illness list due to illicit marijuana vaping. Now there have been 54 deaths and 2,506 hospitalizations. The culprit is Vitamin E acetate, needed to make marijuana tetrahydrocannabinol (THC)products into a vapor because, unlike nicotine, it does not dilute readily.

You may be aware that film runs at 25 frames per second because humans will then not see it as individual images. These 'blinks per second' are measured in Hertz and some humans can see up to 60 Hz.

You may not sleep well if you have a light blinking all night. And a new study shows that in bird care, light control is even more important than realized.

A new study has found that birds of prey have much greater visual acuity but a peregrine falcon is over twice as adept as humans - 129 Hz, which would be like being able to see the details of a race car driver's face as they zoom by you at 200 miles per hour.