Is sonar only used in water? This technology also relies on sound waves to detect objects. However, sonar is typically used underwater. Only they don’t use sound waves. Instead, these two technologies use radio waves or light waves, respectively. Is an ultrasound safe? While ultrasound is generally considered to be safe with very low risks, […]
Why do pigeons nod their head?
How much screen time should a 14 year old have?
What happened to ancestral Puebloans?
What happened to ancestral Puebloans? For more than 700 years they and their descendants lived and flourished here, eventually building elaborate stone communities in the sheltered alcoves of the canyon walls. Then, in the late A.D. 1200s, in the span of a generation or two, they left their homes and moved away. What was the […]
How do you mess up a DNA swab test?
How do you mess up a DNA swab test? Avoid putting anything in your mouth for at least an hour prior to collecting cheek-cell samples. Foreign particles from food, liquids, toothpaste and tobacco byproducts don’t alter the DNA but they can mask it. The consequence is that the sample becomes degraded and therefore unusable for […]
What is the relationship between mass and acceleration when force is constant?
What is the relationship between mass and acceleration when force is constant? Newton’s second law of motion (also known as the force law ) states that… acceleration is directly proportional to net force when mass is constant, and… acceleration is inversely proportional to mass when net force is constant, and consequently… net force is directly […]
Are Glade solid air fresheners Toxic?
Are Glade solid air fresheners Toxic? Swallowing some of a solid, cone-type air freshener is not likely to cause symptoms from the fragrance because it is imbedded into wax, which limits the amount that can be swallowed. Swallowing a small amount of wax is a choking hazard in young children, but is otherwise not expected […]
What bikes are good for hills?
What bikes are good for hills? The two primary suitable options would be hybrid/sport hybrid bikes and non-suspension mountain bikes. You could go the skinny tire “road bike” route, but I would only go there if you plan to go on group rides with groups that ride at road bike speeds, typically averaging 15mph or […]
How do I know if my spark plug is fouled?
How do I know if my spark plug is fouled? The first step is removing the spark plug you want to look at. A normal spark plug will have brown or grayish-tan deposits on the side electrode. Black, dry soot on the electrodes and insulator tip indicates a carbon-fouled plug. Black, oily deposits on the […]