Put a pot of water with 1/2 tsp. salt on the stove getting hot for the pasta. Cook the pasta, stirring occasionally while you are preparing the clams and mussels. Put a pan on the stove at medium high. Add olive oil and the chopped garlic. Salt, pepper and red pepper flakes. Stir it all together and when the garlic starts to get translucent add the clams and mussels. Stir it all together and let it cook for a minute or so.