Bill Cosby Reminds Us That We Can All Be Scientists - Note no precise date given, most likely circa 1990. - <a href="https://en.wikipedia.org/wiki/Public_service_announcement" class="extiw" title="w:Public service announcement">Public service announcement</a> by the <a href="https://en.wikipedia.org/wiki/National_Science_Foundation" class="extiw" title="w:National Science Foundation">National Science Foundation</a>. Screenshot from video.
<a href="https://en.wikipedia.org/wiki/National_Science_Foundation" class="extiw" title="w:National Science Foundation">National Science Foundation</a>
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