"Five Things You Need to Know Today" is a Patch column that provides readers with essential, daily information at a glance.

1. It's going to be hot and muggy today, with highs around 90. According to the National Weather Service, there is a 30-percent chance of rail this afternoon, and if it does hit, it could lead to pretty severe thunderstorms.

2. In case you missed it yesterday, take a look at Venture Out, an extension of our Patch Passport, where you can learn about the best places to visit 15, 30, and 60 minutes away from home in Concord.

3. See the original creations of more than 50 local artists at the Artisans Market and Summer Sale at the Lexington Arts and Crafts Society on Waltham Street in Lexington. The market is open from 10 a.m. - 4 p.m.

4. Barrett & Company Real Estate's collection of peanut butter, jelly, and Fluff for Operation American Soldier is still ongoing. As always, donations may be dropped off at Barrett & Company's Concord, Lincoln and Carlisle Center offices.

5. Although people had already mastered the use of it thousands of years prior without even knowing it, oxygen was officially discovered on this day in 1774 by the British minister and scientist Joseph Priestly.