Senator GROGAN (South Australia) (14:52): There are some who continue to promote the idea of nuclear power. Can the Minister please outline why scientists, industry, business and governments have not pursued nuclear power? Honourable senators interjecting— The PRESIDENT: Before I call the Minister, I would ask that senators— Senator McKenzie interjecting— The PRESIDENT: Senator McKenzie! If you have something to say, take some time during the week. Senator Canavan, are you rising on a point of order? Senator Canavan: I respect your ruling there, President, but we have had a question which has almost obsessively and exclusively focused on one of the opposition party's political conference. I think it's fair to have some leeway. I've got no problem with Senator Wong doing that, but if you're going to give it, you'd better be able to receive it too. The PRESIDENT: The opportunity for receiving it is not question time. There are other opportunities during the week. I would invite senators—particularly those on my left—not to interject because the Minister is entitled to respond to interjections. Minister, please continue.