Close Josh Linn conducts liquid nitrogen experiment I'm not sure if this guy can sing, but we do know he always has something interesting up his sleeves. Josh Linn our favorite scientist from the St. Louis Science Center is here for a fun demo. KSDK 11:50 AM. CST February 06, 2017 TRENDING VIDEOS WFAA Breaking News Family taking action after murder-suicide A stranger emailed me a warning about blood clots. Days later, my friend died from one. Young man recovering at Ranken Jordan STL doctors test new multiple sclerosis drug Families in Chesterfield may lose their homes The hidden St. Louis places you'll see in Superstore Church bus crash kills 13 people Putting the brakes on toll roads in Missouri I-55 back open after deadly crash More Stories Doctors say new MS drug is a breakthrough Mar 29, 2017, 9:40 p.m. UPDATE: 13 dead in church bus crash near Garner State Park Mar 29, 2017, 4:03 p.m. Welcome back, Chester! Mar 29, 2017, 3:17 p.m.