1. The Moths and the Bacteria

2. Peppered Moth
2 types: dark vs. light
Very common in Great Britain

3. early 1800s = pre-industrial England
low pollution
lichen on trees = light colored bark
Moths= light color
late 1800s = industrial
factories = soot coated trees
killed lichen = dark colored bark
Moths= dark color
mid 1900s = pollution controls
clean air laws
return of lichen = light colored bark Moths= light color

4. Bacteria and antibiotics

5. In the 1900s, the first cause of death was bacterial infections.
In 1928, Alexander Fleming discovered penicillin, the first antibiotic.
By the 1950s, antibiotics are widely used to fight infections and bacteria seemed to be under control.
Late 20th century: antibiotics start to lose effectiveness
In 2013, CDC published a report outlining the top 18 drug-resistant threats to the United States. These threats were categorized based on level of concern: urgent, serious, and concerning.

6. Some of the urgent threats (15 total)
Methicillin-resistant Staphylococcus aureus (MRSA)
Streptococcus pneumoniae
Tuberculosis (TB)
Non-typhoidal Salmonella 
Neisseria gonorrhoeae