False. It's not always reliable. For example, in lab mice, saccharin has caused tumors. But for humans to get cancer from saccharin, we would have to take in astronomical levels of saccharin, which we, as humans, don't do.
Tides<span> are the rise and fall of sea levels caused by the combined effects of the gravitational </span>force sexerted by the Moon and the Sun and the rotation of the Earth<span>. The times and amplitude </span>of tides<span> at a locale are </span>influenced<span> by the alignment ..... South of Cape Hatteras the </span>tidal forces<span> are </span>more<span>complex, and cannot be predicted ...</span><span />