A hypersensitivity reaction happens when the immune system mistakenly identifies harmless substances as harmful. There are several types of hypersensitivity reactions, depending on the class of ...

Need a reassuring hug during the COVID-19 pandemic? Facebook has a new feel-good reaction for that. When even the smallest physical gesture to convey support isn’t possible, Facebook and its messaging ...

Everybody wants a little of that TikTok magic. To that end, Twitter is rolling out a new test feature that invites people to post video reactions to tweets instead of quote-tweeting the old-fashioned ...