The world impatiently awaits a COVID-19 vaccine but experts caution we probably won't have one until 2021. Here's why
Contact tracing, a practice whereby health workers find those who have been exposed to a disease, such as COVID-19, in order to stop its spread may help in opening countries that have restricted their population's movements
Independence day celebrates the decision by the 13 original colonies to renounce British rule and form the United States
