The Plymouth Brethren are a conservative, low church, evangelical movement, whose history can be traced to Dublin, Ireland, in the late 1820s, originating from Anglicanism. Among other beliefs, the group emphasizes sola scriptura. Brethren generally see themselves not as a denomination, but as a network, or even as a collection of overlapping networks, of like-minded independent churches. Although the group refused for many years to take any denominational name to itselfa stance that some of them still maintainthe title The Brethren, is one that many of their number are comfortable with in that the Bible designates all believers as brethren.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What belief is the emphasis of the Plymouth Brethren?
Ah, so.. sola scriptura

Most common glass contains other ingredients to change its properties. Lead glass or flint glass is more 'brilliant' because the increased refractive index causes noticeably more specular reflection and increased optical dispersion. Adding barium also increases the refractive index. Thorium oxide gives glass a high refractive index and low dispersion and was formerly used in producing high-quality lenses, but due to its radioactivity has been replaced by lanthanum oxide in modern eyeglasses.[citation needed] Iron can be incorporated into glass to absorb infrared energy, for example in heat absorbing filters for movie projectors, while cerium(IV) oxide can be used for glass that absorbs UV wavelengths.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What property of thorium oxide has caused it to no longer be used in eyeglasses?
Ah, so.. radioactivity

Close to Richmond Park is Kew Gardens which has the world's largest collection of living plants. In 2003, the gardens were put on the UNESCO list of World Heritage Sites. There are also numerous parks administered by London's borough Councils, including Victoria Park in the East End and Battersea Park in the centre. Some more informal, semi-natural open spaces also exist, including the 320-hectare (790-acre) Hampstead Heath of North London, and Epping Forest, which covers 2,476 hectares (6,118.32 acres) in the east. Both are controlled by the City of London Corporation. Hampstead Heath incorporates Kenwood House, the former stately home and a popular location in the summer months where classical musical concerts are held by the lake, attracting thousands of people every weekend to enjoy the music, scenery and fireworks. Epping Forest is a popular venue for various outdoor activities, including mountain biking, walking, horse riding, golf, angling, and orienteering.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Victoria Park is located in what London district?
Ah, so..
the East End