Visit the C&EN website to play our latest quiz: cenm.ag/june-12-quiz
What caused changes in the orientation of nanocrystals in human tooth enamel over our evolution?
• Changes in diet, specifically the addition of meat and agricultural products.
• Increased exposure to fluoride in water.
• Advances in teeth-brushing tools and techniques.
• Genetic mutations unrelated to dietary habits.
Which chemical manufacturer is Australia suing for alleged environmental damages from firefighting foam containing PFAS?
• 3M
• DuPont
• Bayer
• Dow Chemical
What common household product, when combined with a newly discovered iron catalyst, can be used to efficiently create epoxides?
• Bleach
• Baking soda
• Vinegar
• Dish soap
What is the name of the first new ultraviolet filter for US sunscreens approved by the Food and Drug Administration in 30 years?
• Bemotrizinol
• Oxybenzone
• Avobenzone
• Octinoxate
Which advanced gene-editing technology, an evolution of CRISPR, was recently demonstrated to correct pathogenic variants in human embryos?
• Base editing
• RNA interference
• Zinc-finger nucleases
• Transcription activator-like effector nucleases
Which Chinese drug services provider did the Pentagon recently place on a no-hire list for US companies receiving federal funds?
• WuXi AppTec
• Lonza
• Catalent
• PPD
Researchers have developed a light-activated iron catalyst that can pluck oxygen atoms from which common greenhouse gas to oxidize alkenes?
• Carbon dioxide
• Methane
• Nitrous oxide
• Sulfur hexafluoride
C&EN used artificial intelligence in the development of this game, but all the questions and answers were checked by one of our human editors.
