A healthy person usually has a platelet count of 150,000 to 400,000. You have thrombocytopenia if your number falls under 150,000. If you're wondering what the long name means, here's how it breaks down: thrombocytes are your platelets and penia means you don't have enough of something.
The Perseids are active from July 13 to August 26, according to the American Meteor Society, a nonprofit scientific organization that supports the research of astronomers, but the meteor shower peaks between August 12-13.
Bottom line: On any clear night around April 20-23, 2017, the Lyrid meteor shower will kick off at late evening. In 2017, the peak numbers of Lyrid meteors are expected to light up the wee hours before dawn on April 22. A planisphere is virtually indispensable for beginning stargazers.