At a time when the world is facing its biggest social, economic and health challenge in decades - the coronavirus pandemic - children across the globe are coming forward to do their bit, ensuring that the innate compassion for fellow humans remain intact even in the face of adversity. Take Delhi's 16-year-old twin sisters - Asheer and Asees Kandhari - for instance. Along with their teenage friends, Aman Banka and Aditya Dubey, they have been running a COVID-19 helpline without any donation.