[voiceover] In a vacuum, radio waves travel at the same speed as all forms of electromagnetic radiation. That is, 299,792,458 m/s. But human beings do not live in a vacuum. Wherever we are, we're surrounded by stimuli, both positive and negative. When negative stimuli is perceived, it travels from its source to its destination, the sensory cortex, at a mere 100 m/s. But regardless of its relatively slow speed, this unpleasant sensation registers as something we call pain, and as humans, we are conditioned to do anything and everything to avoid it.
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