"Dark Energy. Or, Hunting the Heffalump," by <a href="https://en.wikipedia.org/wiki/Sarah_Tuttle" class="extiw" title="w:Sarah Tuttle">Sarah Tuttle</a>
<p>Dark energy is over 70% of the energy in the universe, and we have no idea what it is. Theory and observation with be bandied about carelessly. Come guess along with us. Points will be awarded for creativity.
</p>
Dr. Sarah Tuttle is the instrument scientist for VIRUS, the wildly replicated spectrograph being built for the Hobby Eberly Telescope Dark Energy Experiment. She never leaves home without a full set of metric hexwrenches.
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<a rel="nofollow" class="external text" href="https://vimeo.com/89974317">“Dark Energy. Or, Hunting the Heffalump,” by Sarah Tuttle</a> at 11:35, edited