From the Marketplace Datebook, here’s a look at what’s coming up Friday:

• In Washington, First Lady Michelle Obama delivers the keynote address at a summit on childhood obesity.

• He won the Nobel Prize in Physics. Albert Einstein was born on March 14, 1879.

• And sticking with the math and science category: You need it to solve some of life’s geometry problems like the area of a circle or the volume of a cylinder. What is Pi? Tomorrow is Pi day.