A small carriage propelled by a steam turbine powered engine was apparently invented by Ferdinand Verbiest, a Belgian, in 1672 while in China. It is argued that this constitutes the first 'car' ever invented, but the design was only 65cm long, had no seats or pilot controls, and was intended as little more than a toy.
In bipolar disorder, mixed state is a condition during which symptoms of both mania and depression occur simultaneously. Individuals experiencing a mixed state may have manic symptoms such as grandiose thoughts while simultaneously experiencing depressive symptoms such as excessive guilt or feeling suicidal.
The classic symptoms of bipolar disorder are the periodic changes in mood, alternating between periods of elevated mood (mania or hypomania) and periods of depression. If you are living with bipolar disorder, you may feel energetic, abnormally happy, and make reckless decisions during manic states. During depressive states, you may feel the overwhelming urge to cry, experience feelings of hopelessness, and have a negative outlook on life.