And Gate in Minecraft

Place two blocks next to each other (distance: one block). Install two redstone-lanes (both connected to a lever) which end in these blocks.

Put two redstone-torches at the other side of these blocks and extract the signal of the torches by connecting the redstone-lanes.

Build another block right next to the extracted signal, and put a redstone torch at its back, too.

Put the output-lane behind this torch.

The output becomes positive, if all inputs are positive.