question:
The constitution of 1983 only listed English and Afrikaans as official languages.
In what decade did European Dutch yield to the local dialect in South Africa?

answer: no

question:
Heartwood formation occurs spontaneously (it is a genetically programmed process).
How does heartwood formation occur due to its being genetically programmed?

answer: yes

question:
Lead glass or flint glass is more 'brilliant' because the increased refractive index causes noticeably more specular reflection and increased optical dispersion.
What is the benefit of thorium oxide in addition to its refractive index?

answer: no

question:
In elsewhere on Great Britain and on Ireland, high density of population is limited to areas around, or close to, a few large cities.
How many people live in the area of London?

answer:
no