3. Make hand-washing ubiquitous. Hand-washing: it seems so simple, so perhaps that’s why so many people ignore it. Around 30% of people don’t wash their hands after using the toilet. Many more neglect to wash their hands before and after cooking. But washing your hands – for at least twenty seconds, with soap and water – makes a huge difference, drastically reducing the rates of diarrhea and respiratory illness in communities, according to the CDC. Hand-washing stations should be available and ubiquitous in movie theaters, restaurants, concert venues, sports stadiums, and especially airports. A recent MIT study found that if sixty percent of travelers at airports had clean hands, compared to just twenty percent now, global disease spread would slow by nearly seventy percent!