Risky invention history: Identify the invention that caused many deaths during early testing. Full question: Which invention caused many deaths while testing it? Choose the correct option.

Difficulty: Easy

Parachute
Safety pin
Ballpoint pen
Velcro

Correct Answer: Parachute

Explanation:

Given data

Framing: Historical testing hazards.

Concept / Approach
Early attempts at human descent devices were perilous. The parachute saw multiple fatal demonstrations in the late 18th and early 20th centuries; a well-known case is Franz Reichelt, who died testing his parachute suit from the Eiffel Tower (1912).

Option analysis
Parachute: Correct — early testing had significant fatality risk. Safety pin, ballpoint pen, velcro: Not associated with systematic fatalities in testing.

Final Answer
Parachute.

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