Reuters: Public health officials in Oregon warned recreational boaters and swimmers who on warm days flock to a river that bisects Portland to stay out of the water on Wednesday after detecting what they suspect is a potentially dangerous toxic algae. Oregon Health Authority officials said they believe the unusual film found at the Willamette River is the result of toxic blue-green algae, which is dangerous to touch, drink or inhale. Filtering the water won't make it safe, and fish from the river could be...