What is the cosmic microwave background radiation?

What fraction of the mass of the Milky Way Galaxy is in a form that astronomers have been able to see?

At an age of 380,000 years, the temperature of the universe had fallen to 3000 K, and electrons could then combine with protons to produce neutral hydrogen gas. What major transition took place in the universe at this time?

 A term male infant is admitted with respiratory distress and desaturation in late winter. Of note, his older sibling is ill at home with respiratory symptoms. The infant is supported with CPAP and supplemental oxygen. His respiratory viral panel returns positive for respiratory syncytial virus. Which of the following treatment options is the most appropriate?

Why would cosmologists expect the rate of expansion of the universe to be slowing down?

You suspect sepsis in a clinically ill 2 week old preterm infant with a fungal skin infection who is now experiencing worsening respiratory distress and feeding intolerance. You have sent a blood culture and CBC with differential. You have started Vancomycin and Gentamicin. In discussing the infant with the attending neonatologist, a decision is made to start her on systemic antifungal therapy in light of the topical infection along with her deterioration in condition. What medication would you order?

Treatment of the infant with rotavirus infection includes which of the following?

At the present time cosmologists believe the structure and behavior of the universe are dominated by

In modern particle physics, the proton and the neutron are now thought to be composed of more fundamental particles called

The distance-measuring techniques, arranged in order of the distance for which they are MOST effective (from least to most) are