\def\GWslide{\slide{Fusion - fuels}{
\twocolumns{0.5\tw}{
Deuterium
\bi
\im 1x deuterium na 6240 vodíků
\ei
\credit{wiki/Timeline of nuclear fusion}{https://en.wikipedia.org/wiki/Timeline_of_nuclear_fusion}
}{0.5\tw}{Tritium
\bi
\im $T_{1/2}$=12.3 y.
\ei
\credit{wiki/Timeline of nuclear fusion}{https://en.wikipedia.org/wiki/Timeline_of_nuclear_fusion}
}
}}