StemRad founder joins former NASA astronaut Scott Kelly to gift Israeli-made anti-radiation vests to first responders, plus one for Ukrainian President Volodymyr Zelensky

Same malfunction pushed back scheduled test flight of spacecraft in April, which hosts demo of Israeli-made radiation suit; Friday is earliest date for next attempt

Liftoff for high-stakes test flight set for Monday morning from Kennedy Space Center; mannequin aboard to test Israeli-made anti-radiation suit

Company to test protective qualities of AstroRad vest on humanoid mannequin aboard Orion spacecraft, set for launch later this month