Potential confounders measured on the self-report survey included level of school (middle school/high school), sex (male/female), race/ethnicity (White/Black/Hispanic/Asian/other), sexual orientation (heterosexual/ gay, lesbian, or bisexual/not sure), tobacco use in household (yes/no), social media usage (never/few times a week/12 hours a day/ 3 hours a day), and average school grades during the past 12 months (mostly A-B/mostly C-D/mostly F/no grade or not sure)
If none is selected, the status will not be counted in the numerator
Polonium-210 emits alpha particles (helium nuclei) as it decays, which have a high energy and can damage DNA, for example by deletation of segments, and cause cell death
this is when the fragrance starts to work its magic
Tobacco smoke includes over 50 harmful chemicals, among which nicotine is the major culprit causing cancer in smokers
The Green and the Brown: A History of Conservation in Nazi Germany , Cambridge University Press, ISBN 0-521-84819-9