You have been tasked to estimate the number of rattlesnakes in the desert by Lone Mountain. You capture 42 rattlesnakes and tag them on the first day. You return to the
site one week later and capture 59 rattlesnakes. Of the 59 you caught, 21 are marked
from the first sample. How many rattlesnakes are in the population?

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the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

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