Bill has an older brother named Dan. Both Bill and Dan are physics professors. According to Frank Sulloway's research on birth-order effects, Bill should

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According to Frank Sulloway's research on birth-order effects, younger siblings tend to be more open to "off-the-wall" or "revolutionary" theories, while older siblings tend to be more conventional and resistant to change. Therefore, as the younger sibling, Bill should be more open to such ideas compared to his older brother Dan.

Bill Has an Older Brother Named Dan