Insert <discovery> here: the role of placeholders in science: Is dark matter the only possible explanation for what we observe, or little more than a placeholder for something we don't fully understand? If it's the latter, then it will join some of the most significant concepts in science.
Yesterday's Delta IV-Heavy rocket launch: a personal impression: The biggest rocket launch ever from the US' West Coast went up on Thursday, and Ars was there to watch. The dynamic range of everything you see, hear, and feel is so large that no recording device can capture the entire range of sensation.
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