Gayathri Vaidyanathan People queue to refill oxygen cylinders for COVID-19 patients at overwhelmed medical facilities in New Delhi, India.Credit: Ishant Chauhan/AP/Shutterstock Scientists are working to understand several coronavirus variants now circulating in India, where a ferocious second wave of COVID-19 has devastated the nation and caught authorities unawares. The country recorded nearly 400,000 new infections...
