He estimated how many species of insects lived on each plant species in England, and then extrapolated that figure across the whole planet. âIf we say 400,000, we shall, perhaps, not be very wide of the truth,â he wrote. Today, scientists know the Westwood figure is far too low.
Symptoms: A chronic dry cough that's worse at night, disturbing sleep, and sometimes with wheezing and shortness of breath. Causes: An irritating night cough is often the first sign of asthma, especially in children, but you can develop it at any age. It's also a sign asthma is worsening or not being well controlled.
1 Rhinitis of pregnancy is a condition that can lead to coughing. 2  Many women experience congestion throughout their pregnancies. 3  The congestion can lead to irritation and coughing. 4  Elevated estrogen levels can cause mucous membranes that line the nose to swell, which increases blood flow to the area and causes swelling. dry cough may occur during a common cold. The virus can be an irritant that causes a coughing reaction and the problem may become worse at night. Many women experience cold-like symptoms during pregnancy, which can lead to productive and unproductive coughs.