        title: 'Cross Product',
            latex: `\\mathbf{V}_1 \\times \\mathbf{V}_2 =  \
            \\begin{vmatrix}
    \\mathbf{i} & \\mathbf{j} & \\mathbf{k} \\\\[.25em]
    \\frac{\\partial X}{\\partial u} &  \\frac{\\partial Y}{\\partial u} & 0 \\\\[.5em]
    \\frac{\\partial X}{\\partial v} &  \\frac{\\partial Y}{\\partial v} & 0
\\end{vmatrix}`,
          },
          {
            title: 'Maxwell‚Äôs Equation',
            pic: 'maxwell.gif',
            comment: `The magnetic field induced