...because neither are found in Trinity College . -- BobacusAll good entries, but MoonShadow takes it.
...because neither convert ntl to a ball . -- K
...because both are required for a healthy heart . -- MoonShadow
...because both are required for intergalactic travel . -- ChrisHowlett
...because neither can be used as a replacement for Margaret Thatcher . -- MikeJeggo