On February 11, 2016 a team of scientists announced the direct detection of gravitational waves, first described by Einstein in 1916. It has stirred the scientific world to a degree I have not seen in many years. The information available on these waves and their detection can get very detailed. I have selected two links for those readers with different levels of interest. The first is from You Tube where there are number of excellent videos and explanations for those of us who would like a less detailed explanation. The second link is to an article from Science magazine which goes into more detail.