# Question on Quora

**URL:** https://discourse.julialang.org/t/question-on-quora/64451
**Category:** Offtopic
**Created:** [July 11, 2021, 6:23am UTC](https://discourse.julialang.org/t/question-on-quora/64451 "2021-07-11T06:23:16Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![johnh](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/johnh/32/3615_2.png) [@johnh](https://discourse.julialang.org/u/johnh)
#### Post date: [July 11, 2021, 6:23am UTC](https://discourse.julialang.org/t/question-on-quora/64451/1 "2021-07-11T06:23:17Z")

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For anyone who uses Quora, there is a thread below.  
I am looking for a reference to the ballista/catapult example where SciML and Flux are combined.  
I think this was a talk by Chris Rackaucas - but cannot find the exact one.  
A canonical JuliaCon presentation on composability would be appreciated.

> **[What will replace or replaced Fortran in extremely high performance numerical...](https://www.quora.com/What-will-replace-or-replaced-Fortran-in-extremely-high-performance-numerical-computing)**
>
> Answer (1 of 8): I designed, built, and operated supercomputing clusters (Linux systems interconnected with Myrinet at first, then Infiniband) at a national lab (Fermilab) for 16 years. They were used exclusively for extremely high performance...