Paul GrahamVerified account

it's not contradictory, they said you can't get it from surfaces unless someone sick just cough on it, because virus won't survive there unlike laboratory conditions so yes, if someone cough directly at you,you can get infected, from touching goods in supermarket,highly unlikely

No, this is a simulation of what droplets or aerosols might do if they actually are produced in the amounts and sizes that they expect. There's no validation or intention to validate. No settled science on how much someone breathing or coughing near you would increase your risk.