People may live on Mars one day.
Speculation
Hippocrates was probably born in 460 B.C.
Speculation
Rain is likely tomorrow.
Speculation
This class might finish early today.
Speculation
Life will be very different in 100 years.
Speculation
I believe that everyone will speak English one day.
Speculation
Cars may fly in the future.
Speculation
A triangle has three sides.
Fact
A week has seven days.
Fact
Dogs have four legs.
Fact
London is the capital of England.
Fact
The heart pumps blood through the body.
Fact
Water freezes at 0°C.
Fact
The Earth goes around the Sun.
Fact