Context: He immersed himself in work on the project, and was present at the Trinity bomb test. Feynman claimed to be the only person to see the explosion without the very dark glasses or welder's lenses provided, reasoning that it was safe to look through a truck windshield, as it would screen out the harmful ultraviolet radiation. On witnessing the blast, Feynman ducked towards the floor of his truck because of the immense brightness of the explosion, where he saw a temporary "purple splotch" afterimage of the event.

Question: Feynman used this to protect his eyes during the test detonation
Answer: truck windshield

Question: What atomic bomb test did Feynman see?
Answer: Trinity bomb test

Question: What did Feynman see after the atomic test?
Answer: "purple splotch" afterimage

Question: What did Feynman think that the truck windshield would shield him against?
Answer: ultraviolet radiation

Question: What bomb test was Feynman not present for?
Answer: Unanswerable

Question: What was invisible to Feynman after the atomic test?
Answer: Unanswerable

Question: What did Feynman think that wind would shield him against?
Answer: Unanswerable

Question: Why did Feynman decide never to have a truck?
Answer: Unanswerable