Which accidental scientific discovery led to the development of PTFE-lined packaging that revolutionized both laboratory chemical storage and later consumer product preservation?

In the world of scientific products, packaging innovation can sometimes come from unexpected places. This poll tests your knowledge about a famous scientific discovery that revolutionized how laboratory chemicals and later consumer products were packaged and preserved. The innovation was initially developed for a scientific purpose but eventually transformed packaging across multiple industries.

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Roy Plunkett's discovery of Teflon while researching refrigerants at DuPont in 1938
Spencer Silver's development of low-tack adhesive while attempting to create super-strong adhesives at 3M in 1968
Wilson Greatbatch's invention of the implantable pacemaker while building a heart rhythm recording device in 1956
Percy Spencer's discovery of microwave cooking potential while testing a magnetron for radar equipment in 1945