别说博士了， 就是知名教授也有很糊涂，或者装糊涂的。

这个人，著名物理学家， 一直跟大众的健康， 科学界打仗。 他打过仗的战场：

1. 二手烟损害健康

2. 臭氧层的修复

3. 紫外想导致皮肤癌。

4. 大气暖化

我记得还有酸雨。。  去年去世了， 真是罪不容诛。

Siegfried Fred Singer (September 27, 1924 – April 6, 2020)^[1][2] was an Austrian-born American physicist and emeritus professor of environmental science at the University of Virginia,^[3] trained as an atmospheric physicist. He was known for rejecting the scientific consensus on several issues:

• climate change,^[4][5][6]
• the connection between UV-B exposure and melanoma rates,^[7]
• stratospheric ozone loss being caused by chlorofluoro compounds, often used as refrigerants,^[8] and
• the health risks of passive smoking.