Bioluminescence,theeerie,beautifulphenomenathatallowslivingthingstoglow,iswaymoreancientthanpreviouslythought,accordingtoateamofresearchersthatrecentlystudiedtheabilityinoctocorals. Octocoralsarenotcloselyrelatedtocorals,despitetheirname.Theyareagroupofmarineinvertebratesthatreside—andglow—inEarth’soceans.Butoctocoralshavebeenilluminatingtheseasfor...