This is a power point designed to last at least 15-20 minutes. This includes a couple slides discussing recent discoveries, why science is important and 2 competitions you could run at your school, it also includes 2 links to optional youtube videos you can show as part of the assembly.
The ppt will need to be tweaked to your schools activities. If you aren’t running any to discuss as part of the assembly it will be 10 mins max.
You can also add your schools weekly science activities to discuss.