Top 100 presentations

1. Continuous Verb Tenses
   35499
2. Support and transport in plants
   33959
3. Anyong Tubig Anyong Lupa sa Asya
   29518
4. Elements compounds and mixtures
   26132
5. Chromosome
   22248
6. Simple Verb Tenses
   20857
7. Atomic Structure
   20387
8. Balancing Chemical Equations. Balancing redox equations
   20259
9. Periodic Behavior
   19971
10. Newton’s laws of motion
    18995
11. Periodic Trends
    16795
12. Adverbs
    16675
13. Percent Composition, Empirical and Molecular Formulas
    16038
14. Animal Farm
    15879
15. Bonding, Molecular Shape & Structure
    14836
16. Circulation and Gas Exchange
    13591
17. MakingFood
    13492
18. DNA - An overview
    13221
19. Atomic Structure and Periodic Trends
    13022
20. Fungi
    12948
21. Volumetric
    12759
22. Atomic Structure and Periodicity
    12592
23. Feminism- Cure or Curse
    12591
24. Hormones and the Endocrine System
    12315
25. Animal Development
    12239
26. Derivation Applications of Bernoulli Principal
    11962
27. Osmoregulation and Excretion
    11605
28. Plasma Membrane-Gateway to the Cell
    10863
29. Plant Structure, Growth, and Development
    10856
30. Acid, bases and salts
    10405
31. Development
    10309
32. Mirrors and Lenses
    10246
33. Structure of the Atom
    9997
34. Balanced forces
    9978
35. Ancient Civilizations
    9882
36. Mass Spectrometry
    9799
37. Pronouns
    9778
38. Resource Acquisition and Transport in Vascular Plants
    9777
39. Nouns
    9737
40. Support and transport in plants
    9435
41. Forests
    9429
42. Atomic Structure
    9373
43. Newton’s third law of motion
    9027
44. Cell Types and Cell Structure
    9019
45. Animal Nutrition
    8824
46. Transplantation Immunology
    8695
47. Cellular respiration
    8553
48. Sensory and Motor Mechanisms
    8467
49. Growing Plants
    8441
50. Plant Responses to Internal and External Signals
    8335
51. Electrical Circuits
    8302
52. Lab Equipment
    8100
53. Prepositions
    8016
54. Neurons, Synapses, and Signaling
    8003
55. Viruses, Viroids, and Prions
    7946
56. Of Mice and Men
    7887
57. A Tour of the Cell
    7870
58. Basic Structure of a Cell
    7712
59. Real time PCR and it's functions in diagnosis
    7678
60. Covalent Bonding (Molecules)
    7625
61. Plant structure adaptations and responses
    7580
62. Cellular Division
    7505
63. Ionic Bonding
    7484
64. Mendelian Genetics
    7162
65. To Kill a Mockingbird
    7132
66. Satellite Orbits and Uses NIS
    7096
67. Sound
    7090
68. Blood Type Genetics
    7068
69. Well logging The Bore Hole
    6970
70. Molecules and Ions
    6952
71. The Immune System
    6952
72. Membrane Structure and Function
    6875
73. Animal Reproduction
    6819
74. The Chemistry of Acids and Bases
    6797
75. Angiosperm Reproduction and Biotechnology
    6756
76. Mendel and the Gene Idea
    6693
77. Plant Diversity
    6688
78. Cell Communication
    6653
79. Rocks
    6645
80. Balancing Chemical Equations
    6544
81. Rate Laws
    6409
82. Introduction to Oscillations and Simple Harmonic Motion
    6386
83. Drama
    6372
84. Hybridization of Orbitals
    6352
85. The Building Blocks of Matter Atoms
    6314
86. An Introduction to Metabolism
    6258
87. Empirical Formula
    6243
88. Electron Quantum Numbers
    6215
89. Translation. Protein from RNA
    6111
90. Neurons
    6090
91. The Structure and Function of Large Biological Molecules
    6082
92. Photosynthesis
    6019
93. The Mole
    5935
94. Cell Membrane + Tissues & Organs Definitions
    5923
95. Earthquakes
    5879
96. Karyotypes
    5859
97. ADP, ATP and Cellular Respiration
    5834
98. Endocrine System
    5768
99. Classical greek philosophy
    5756
100. Population Ecology
     5750

Research and Development, Experimental aerospace engineering center in Serbia (Space Technologies)