Conversation so far:
What is a current project David Attenborough is working on?
In 2019, Attenborough narrated Our Planet, an eight-part documentary series, for Netflix.
What else did David Attenborough do project-wise in 2019, besides Our Plant?
In March 2019, It was announced that Attenborough is to present an urgent one-off film documentary about climate change for BBC One called Climate Change – The Facts.
What is the Children's Prom in 2009?
There was a child-oriented Prom to mark the Darwin bicentenary as well as a Free Family Prom including the Proms Family Orchestra.
Are there any other interesting aspects about this article on David Attenborough besides his recent work and work on the Proms in 2019?
He is the only person to have won BAFTAs for programmes in each of black and white, colour, HD, 3D and 4K.
Is David Attenborough collaborating with anyone of note?
Attenborough forged a partnership with Sky, working on documentaries for the broadcaster's new 3D network, Sky 3D.
What did David Attenborough work with Sky 3D on?
Their first collaboration was Flying Monsters 3D, a film about pterosaurs which debuted on Christmas Day of 2010.
What happened after the premiere of Flying Monsters 3D in regards to David Attenborough and Sky 3D?
A second film, The Bachelor King 3D, followed a year later.
What is the most fascinating aspect of this article on David Attenborough besides his documentary work and BAFTA Awards?
He is the younger brother of the director, producer and actor Richard Attenborough, Baron Attenborough, and older brother of the motor executive John Attenborough.
What was the 1936 Grey Owl lecture at De Montfort Hall about?
David Attenborough had been influenced by Grey Owl's advocacy of conservation.

Question: What else did he have to say?
Self-contained rewrite: What else did Richard Attenborough have to say about his brother's experience attending the Grey Owl lecture?