Russia urges the U.S. to respect Americans’ right to protest and to ‘observe democratic standards’. The Russian Foreign Ministry said, “it’s time for the U.S. to drop the mentor’s tone and look in the mirror”
166 MPs from all parties call for UK to stop tear gas and rubber bullet exports to US. Separate petition calling for suspension of exports nears half a million signatures
Our Sun is a huge ball of electrically-charged hot gas. This charged gas moves, generating a powerful magnetic field. The Sun's magnetic field goes through a cycle, called the solar cycle.
Every 11 years or so, the Sun's magnetic field completely flips. This means that the Sun's north and south poles switch places. Then it takes about another 11 years for the Sun’s north and south poles to flip back again.
The solar cycle affects activity on the surface of the Sun, such as sunspots which are caused by the Sun's magnetic fields. As the magnetic fields change, so does the amount of activity on the Sun's surface.
A pacemaker is a small device that's placed under the skin in your chest to help control your heartbeat. It's used to help your heart beat more regularly if you have an irregular heartbeat (arrhythmia), particularly a slow one. Implanting a pacemaker in your chest requires a surgical procedure.
Types of pacemakers-
Depending on your condition, you might have one of the following types of pacemakers.
Single chamber pacemaker.- This type usually carries electrical impulses to the right ventricle of your heart.
Dual chamber pacemaker- This type carries electrical impulses to the right ventricle and the right atrium of your heart to help control the timing of contractions between the two chambers.
Biventricular pacemaker- Biventricular pacing, also called cardiac resynchronization therapy, is for people with heart failure with abnormal electrical systems. This type of pacemaker stimulates the lower chambers of the heart (the right and left ventricles) to make the heart beat more efficiently.