These are segments of the columnar stem of what fossil echinoderm animal? Each disk is a single crystal of calcium carbonate, and in life the animal's living tissue threaded through the hole passing through the stack of disks.

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Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks

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