The text describes the effects of the black widow’s venom on humans as causing stomach cramps and nausea, but just reading this book was enough to give those symptoms to this arachniphobe.  The information is very detailed, as are the up-close, full-color photos that illustrate the text.  I figure if it made me squirm this much, it’s going to delight those who are interested in the topic, and it certainly works as a solid research tool.